<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <script type="text/javascript" charset="utf-8" src="/scripts/jquery/jquery-1.11.2.min.js"></script>
    <script>
        $(function(){
            $('#mlist').append('<div>123</div>');
			$('#mlist').append('<div>123</div>');
			$('#mlist').append('<div>123</div>');
			$('#mlist').append('<div>123</div>');
            alert($('#mlist').height());//有输出结果 18

        });

    </script>
</head>
<body>
<div id="mlist"></div>

</body>
</html>